The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 06, 2006
Filed:
Mar. 08, 2002
Hidekazu Nakamoto, Kudamatsu, JP;
Susumu Harada, Kudamatsu, JP;
Norifumi Maeda, Kudamatsu, JP;
Shuji Yamaguchi, Tokuyama, JP;
Hidekazu Nakamoto, Kudamatsu, JP;
Susumu Harada, Kudamatsu, JP;
Norifumi Maeda, Kudamatsu, JP;
Shuji Yamaguchi, Tokuyama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
Polybutylene terephthalate having good heat stability and excellent hydrolysis resistance is continuously produced in a series of a first reactor for reacting an aromatic dicarboxylic acid comprising terephthalic acid as a main ingredient or a derivative thereof with a glycol comprising 1,4-butanediol as a main ingredient, a second reactor for polycondensating the oligomer from the first reactor, and a third reactor for further polycondensating the low polymerization product from the second reactor, or followed by a fourth reactor for further polycondensing the polyester from the third reactor. Another third reactor or a plurality of third reactors can be provided in parallel to the third reactor.